Supply box



FIG. 1 is a perspective view of a supply box showing our new design;

FIG. 2 is a top plan view of the supply box of FIG. 1;

FIG. 3 is an elevational front view of the supply box of FIG. 1; and,

FIG. 4 is an elevational rear view of the supply box of FIG. 1.

The broken line showing of a supply box is for illustrative purposes only and forms no part of the claimed design. 

We claim the ornamental design for a supply box, as shown and described. 